<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title></title>
    <style>
        body{
            margin: 0 auto;
        }
        .pg-header{
            height: 48px;
            background-color: blue;
        }
        .pg-body .menu{
            background-color: #dddddd;
            position: absolute;
            top: 50px;
            left: 0;
            bottom: 0;
            width: 200px;
            overflow: auto;
        }
        .pg-body .contents{
            background-color: aliceblue;
            position: absolute;
            right: 0;
            top: 50px;
            bottom: 0;
            left: 210px;
            overflow: auto;
        }
    </style>
</head>
<body>
<div class="pg-header"></div>
<div class="pg-body">
    <div class="menu">
        <a>123</a><br>
        <a>123</a><br>
        <a>123</a><br>
        <a>123</a><br>
        <a>123</a><br>
        <a>123</a><br>
        <a>123</a><br>
        <a>123</a><br>
        <a>123</a><br>
        <a>123</a><br>
        <a>123</a><br>
        <a>123</a><br>
        <a>123</a><br>
        <a>123</a><br>
        <a>123</a><br>
        <a>123</a><br>
        <a>123</a><br>
        <a>123</a><br>
        <a>123</a><br>
        <a>123</a><br>
        <a>123</a><br>
        <a>123</a><br>
        <a>123</a><br>
        <a>123</a><br>
        <a>123</a><br>
        <a>123</a><br>
        <a>123</a><br>
        <a>123</a><br>
        <a>123</a><br>
        <a>123</a><br>
        <a>123</a><br>
        <a>123</a><br>
        <a>123</a><br>
        <a>123</a><br>
        <a>123</a><br>
        <a>123</a><br>
        <a>123</a><br>
        <a>123</a><br>
        <a>123</a><br>
        <a>123</a><br>
        <a>123</a><br>
        <a>123</a><br>
        <a>123</a><br>
        <a>123</a><br>
        <a>123</a><br>
        <a>123</a><br>
        <a>123</a><br>
        <a>123</a><br>
        <a>123</a><br>
        <a>123</a><br>
        <a>123</a><br>
        <a>123</a><br>
        <a>123</a><br>
        <a>123</a><br>
        <a>123</a><br>
        <a>123</a><br>
        <a>123</a><br>
        <a>123</a><br>
        <a>123</a><br>
        <a>123</a><br>
        <a>123</a><br>
        <a>123</a><br>
        <a>123</a><br>
        <a>123</a><br>
        <a>123</a><br>
        <a>123</a><br>
        <a>123</a><br>
        <a>123</a><br>
        <a>123</a><br>d

    </div>
    <div class="contents">
        afasdfsdf
        <!--<div style="height: 1000px;">-->
            <!--<h1 style="color: red;">dkfkdfkdkfk</h1>-->
        <!--</div>-->
        <h1 style="color: red;">dkfkdfkdkfk</h1>
        <h1 style="color: red;">dkfkdfkdkfk</h1>
        <h1 style="color: red;">dkfkdfkdkfk</h1>
        <h1 style="color: red;">dkfkdfkdkfk</h1>
        <h1 style="color: red;">dkfkdfkdkfk</h1>
        <h1 style="color: red;">dkfkdfkdkfk</h1>
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        <h1 style="color: red;">dkfkdfkdkfk</h1>
        <h1 style="color: red;">dkfkdfkdkfk</h1>
        <h1 style="color: red;">dkfkdfkdkfk</h1>
        <h1 style="color: red;">dkfkdfkdkfk</h1>
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        <h1 style="color: red;">dkfkdfkdkfk</h1>
        <h1 style="color: red;">dkfkdfkdkfk</h1>
    </div>
</div>
</body>
</html>